Welding A 106 Gr.B pipe to A 36

[yogigolf]

We are welding a 14" sch 100 A 106 Gr. B pipe to 1 1/4" A 36 plates the full circumference every 36". We ae using FCAW with Co2 and making 2 passes. We are not preheating or post heating. The ambient temperature is in the mid 70F. The latest pipe is showing cracks along the edge of the second pass. Any suggestions?

 

[metengr]

Your wicking too much heat away from the weld region into the 1.25" thick base plate. Use a preheat of 200 deg F.